The Parker type PSG moisture liquid indicator combines two functions of moisture and liquid indication into a single economical product. The indicator is a porous filter paper that is sensitive to moisture. A blue dark color indicates the refrigerant is dry. A pink color indicates the refrigerant is wet. The indicator is formulated so that it changes color at the moisture levels generally accepted as the safe operating range. Also, one can see through the sight glass to determine refrigerant is at the proper level in the liquid line to feed the expansion device. Each valve is factory tested to ensure positive leak-free performance.

Sporlan® Sight Glass Moisture Indicator, PSG Series, 3/8 in Fitting, Male Flare Connection, 650 psi, R-12, R-22, R-134A, R-502, R-404A, R-507, R-407C, R-410A Refrigerant, Copper/Steel, 40 to 60 deg F, 3.37 in L x 1.31 in W

• One indicator for all refrigerants
• Reliable and accurately calibrated color change
• Replaceable indicator element
• Indicator protected from discoloration and dirt
• Color changes are easily distinguished and reversible
• Large full view of sight glass
• Disassembly for installation is unnecessary